<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <div v-if="isLogin">
    <input type="text" v-model="newName">
    <input type="button" value="添加" @click="arr.push(newName)">
    <a href="javascript:void(0)" @click="isLogin=false">登出</a>
  </div>
  <div v-else>
    <a href="javascript:void(0)">注册</a>
    <!--果超链接点击时不离开此页面需要添加avascript:void(0)
    废掉跳转功能-->
        <a href="javascript:void(0)" @click="isLogin=true">登录</a>
      </div>

    <ul>
      <li v-for="name in arr">{{name}}</li>
    </ul>
  </div>


    <script src="../js/vue.js"></script>
    <script>
      let v = new Vue({
        el:"body>div",
        data:{
          arr:["刘备","关羽"],
          isLogin:false,
          newName:""
        }
      })
    </script>
    </body>
    </html>